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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69101c16d079fcb5747718c619bd7c0aa5e37ec000778b0cd0ceea2dccd5f895' 
  AND token = 'lh4cfgSJB2L5yEqDkwiWYiw8MEsDMo1eAMCXOfOJe9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}